The Milwaukee skyline as seen from Lakeshore State Park ... Other U.S. cities on the list are New York City, Chicago and Seattle. "If it's not Chicago, the Midwest is often overlooked.

Amtrak's Borealis line, connecting Milwaukee to the Twin Cities and Chicago, has surpassed 100,000 passengers in its first five months. The route, which debuted in May, has seen an average of 650 ...